GM2 CAT.OP.MPA.185 Planning minima for IFR flights — aeroplanes
CAA ORS9 Decision No. 47
Text in magenta in force from 30 October 2025
AERODROME WEATHER FORECASTS
| APPLICATION OF AERODROME FORECASTS (TAF & TREND) TO PRE-FLIGHT PLANNING (ICAO Annex 3 refers) | |||||||
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1. APPLICATION OF INITIAL PART OF TAF a) Application time period: From the start of the TAF validity period up to the time of applicability of the first subsequent ‘FM…*’ or ‘BECMG’, or if no ‘FM’ or ‘BECMG’ is given, up to the end of the validity period of the TAF. b) Application of forecast: The prevailing weather conditions forecast in the initial part of the TAF should be fully applied with the exception of the mean wind and gusts (and crosswind) which should be applied in accordance with the policy in the column ‘BECMG AT and FM’ in the table below. This may however be overdue temporarily by a ‘TEMPO’ or ‘PROB**’ if applicable according to the table below. |
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2. APPLICATION OF FORECAST FOLLOWING CHANGE INDICATION IN TAF AND TREND |
| TAF or TREND for AERODROME PLANNED AS: | FM(alone) andBECMG AT: | BECMG(alone),BECMG FM, BECMG TL, BECMG FM…*TL, in case of: | TEMPO(alone), TEMPO FM, TEMPO FM…TL, PROB30/40(alone) | PROB TEMPO | |||
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| Deterioration and Improvement |
Deterioration |
Improvement |
Deterioration | Improvement | Deterioration and Improvement | ||
| Transient/Shower Conditions in connection with short- lived weather phenomena, e.g. thunderstorms, showers | Persistent Conditionsin connection with e.g. haze, mist, fog, dust/sandstorm, continuous precipitations | In any case | |||||
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DESTINATIONat ETA ± 1 HR TAKE – OFF ALTERNATE at ETA ± 1 HR DEST. ALTERNATE at ETA ± 1 HR EN-ROUTE ALTERNATE at ETA ± 1 HR |
Applicable from the start of the change Mean wind Should be within required limits Gusts: May be disregarded |
Applicable from the time of the start of the change Mean wind Should be within required limits Gusts: May be disregarded |
Applicable from the time of the end of the change Mean wind Should be within required limits Gusts: Maybe disregarded |
Not applicable Mean wind and gusts exceeding required limits may be disregarded |
Applicable Mean wind: Should be within required limits Gusts: May be disregarded |
Should be disregarded |
Deterioration may be disregarded. Improvement should be disregarded including mean wind and gusts. |
| ETOPS ENRT ALTN at earliest/latest ETA ± 1 HR |
Applicable from the time of start of change Mean wind:Should be within required limits Gusts exceeding crosswind limits should be fully applied |
Applicable from the time of start of change Mean wind:Should be within required limits Gusts exceeding crosswind limits should be fully applied |
Applicable from the time of end of change Mean wind:Should be within required limits Gusts exceeding crosswind limits should be fully applied |
Applicable if below applicable landing minima Mean wind: Should be within required limits Gusts exceeding crosswind limits should be fully applied |
Applicable if below applicable landing minima Mean wind: Should be within required limits Gusts exceeding crosswind limits should be fully applied |
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Note 1: ‘Required limits’ are those contained in the Operations Manual. Note 2: If promulgated aerodrome forecasts do not comply with the requirements of ICAO Annex 3, operators should ensure that guidance in the application of these reports is provided. * The space following ‘FM’ should always include a time group e.g. ‘FM1030’. |
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GM2 CAT.OP.MPA.185 will be deleted on 30 October 2025